1. Department of Surgery; Hospital Group Twente (ZGT) Almelo; Almelo The Netherlands
2. Department of Medical Oncology; Hospital Group Twente (ZGT) Almelo; Almelo The Netherlands
3. Department of Radiation Oncology; Medisch Spectrum Twente (MST) Enschede; Enschede The Netherlands
4. Department of Epidemiology and Statistics; Hospital Group Twente (ZGT) Almelo; Almelo The Netherlands